There is a new version of the Dovecot IMAP and POP3 server released. It’s a bug fix release that where discoverd since the last release. I’ve updated all my test servers without any issue. Here is a list of issues fixed:

Mailbox names with control characters can’t be created anymore. Existing mailboxes can still be accessed though.

Allow namespace prefix to be opened as mailbox, if a mailbox already exists in the root dir.

Maildir: dovecot-uidlist was being recreated every time a mailbox was accessed, even if nothing changed.